I wanted to say congrats on taking the world record back. I also wanted to say that almost all atari emulators run the same bc an atari isnt that powerful of a system, so finding an emulator that runs slow will be pretty hard, even on a smartphone. Cheers mate.
smartphone emulation is a developing field, where the priority is not necessarily on to-the-frame accuracy. they are outright banned across a large number of other boards for this reason, they're just not accurate enough to keep a meaningful board. they can be too fast, or too slow, even for the humble atari 2600.
you are still free to try the 2 categories, there's still some way to go on both, but if you have the option I would recommend using some of the more tried and trusted options. hope you have another few attempts and have fun trying them out !